Delete row sig_b9af90147ca8 from signals

id sig_b9af90147ca8
event_id evt_21aa9838315b
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_ead8428c6 ...
dedupe_key signal_enriched:news_delta:6858da966170ac85
throttle_s 0
created_at 2026-04-12T17:02:05.349888+00:00
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